1100221221 has 8 divisors (see below), whose sum is σ = 1600321824. Its totient is φ = 666800720.

The previous prime is 1100221219. The next prime is 1100221319. The reversal of 1100221221 is 1221220011.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1100221221 - 2¹ = 1100221219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1100221197 and 1100221206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100225221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16669986 + ... + 16670051.

It is an arithmetic number, because the mean of its divisors is an integer number (200040228).

Almost surely, 2^1100221221 is an apocalyptic number.

1100221221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1100221221 is a deficient number, since it is larger than the sum of its proper divisors (500100603).

1100221221 is a wasteful number, since it uses less digits than its factorization.

1100221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33340051.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1100221221 is about 33169.5827679517. The cubic root of 1100221221 is about 1032.3493114359.

Adding to 1100221221 its reverse (1221220011), we get a palindrome (2321441232).

It can be divided in two parts, 11002 and 21221, that added together give a palindrome (32223).

The spelling of 1100221221 in words is "one billion, one hundred million, two hundred twenty-one thousand, two hundred twenty-one".